If you’re planning on hitting the skies anytime soon, you may have to pay for more than just your ticket.

You’ll want to avoid several things, including a $100 carry-on fee. Spirit Airlines charges that each way for a carry-on bag if you wait to pay for it at the airport gate.

If you’re flying American, Delta, United, or U.S. Airways, it will cost you $200 to change the dates of your flight or cancel it.

Plus, if you decide to change it over the phone, you’ll pay an additional $20 to $25. But, if you change your flight online, there’s no additional cost.

And if your baggage is over the allowed limit of 50 lbs, you’ll have to shell out $200 for that, too, if you’re flying on Delta. That’s in addition to the regular checked baggage fee of $25 for your first checked bag, and $35 for a second.

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